Is a pie chart or a histogram better at displaying relative frequencies for a qualitative variable? I am having trouble determining because both can be used

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Is a pie chart or a histogram better at displaying relative frequencies for a qualitative variable?

I am having trouble determining because both can be used.

Which one is a characteristic of a binomial experiment:

-The experiment consists of k identical trials-The probability of a success on a single trial remains the same from trial to trial?

I think it's the probability of a success on a single trial remains the same from trial to trial, but I am not 100% sure.